Sensitivity Analysis on the Dynamic Characteristics of a 1000 MW Turbo-Generator Rotor

A modeling through sensitivity analysis is one of the promising methods to investigate the dynamic characteristics of complex mechanical parts. This study aimed to investigate the effect of sensitivity based on mass and stiffness modification in automobile crankshaft as a function of natural frequency. Verification for the crankshaft model that is used in the experiment and simulation was done and both results showed good agreement and small errors percentage. The modification was also done by reducing the different percentage of crankshaft’s mass and stiffness. Partial differential analysis was used in the sensitivity analysis in order to figure out the natural frequency after every set of modification. According to the results, we also found that there were changes of sensitivity value by changes in mass value but the stiffness value remains unchanged. However, there is no significant effect of stiffness reduction on vibration was found in this research.

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Experimental Study of Water Flow in Full-Size Test Rig for Water-Cooled Turbo-Generator Rotor

Proceedings of the Institution of Mechanical Engineers ◽

10.1243/pime_proc_1966_181_011_02 ◽

1966 ◽

Vol 181 (1) ◽

pp. 53-73 ◽

Cited By ~ 6

Author(s):

I. K. Csillag

Keyword(s):

Operating Conditions ◽

Experimental Investigations ◽

Air Cooling ◽

Test Rig ◽

Full Size ◽

Generator Rotor ◽

Turbo Generator ◽

Hydrogen Cooling ◽

Major Factors ◽

Design And Manufacture

The demand for electric power has doubled in the last decade. The most economical way to meet this demand is by building large-output generating units. The study of the major factors which determine the output of such generators shows that the only effective way to increase the output is by improving the cooling of their windings. For that reason design has progressed from air-cooling to indirect hydrogen-cooling, then to direct hydrogen-cooling. Now the trend is towards direct water-cooling where the water is in direct contact with the copper windings. The introduction of water into the stator winding was established in 1956 (1)† and was in fact directly responsible for the present increase in unit rating. The introduction of water to a rotating winding presents difficult problems in both design and manufacture. The test rig dealt with in this paper was built to study some of these problems and to carry out experimental investigations on a full size model of the special hydraulic features for a water-cooled turbo-generator rotor. The investigations were concentrated around the following five different problems which are dealt with in detail: (1) increase in pressure drop due to rotation; (2) free-rotating seal (inlet seal) (2); (3) vacuum-breaking device (water outlet) (3); (4) loss-distribution in the rotor; (5) measurement of the rotor vibrations in various operating conditions.

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STUDY ON NONLINEAR STABILITY FOR A 200 MW TURBO-GENERATOR ROTOR-BEARING SYSTEM

Journal of Mechanical Engineering ◽

10.3901/jme.2005.02.170 ◽

2005 ◽

Vol 41 (02) ◽

pp. 170 ◽

Cited By ~ 8

Author(s):

Ying Cui

Keyword(s):

Nonlinear Stability ◽

Generator Rotor ◽

Turbo Generator ◽

Rotor Bearing ◽

Bearing System

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Study on the Flow Characteristics of Radial Ventilation in Turbo-generator Rotor

Journal of Mechanical Engineering ◽

10.3901/jme.2010.14.138 ◽

2010 ◽

Vol 46 (14) ◽

pp. 138

Author(s):

Xiaohong HU

Keyword(s):

Flow Characteristics ◽

Generator Rotor ◽

Turbo Generator

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Research on Fault Location Method for Inter-Turn Short Circuit of Turbo-generator Rotor

2019 4th International Conference on Power and Renewable Energy (ICPRE) ◽

10.1109/icpre48497.2019.9034878 ◽

2019 ◽

Author(s):

Fuchun Sun ◽

Jihao Wang ◽

Ming Li ◽

Andong Wang ◽

Zhiwei Cao ◽

...

Keyword(s):

Fault Location ◽

Short Circuit ◽

Location Method ◽

Generator Rotor ◽

Turbo Generator

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A Pareto-Based Genetic Algorithm Search Approach to Handle Damped Natural Frequency Constraints in Turbo Generator Rotor System Design

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.1760529 ◽

2004 ◽

Vol 126 (3) ◽

pp. 619-625 ◽

Cited By ~ 8

Author(s):

Anders Angantyr ◽

Jan Olov Aidanpa¨a¨

Keyword(s):

Genetic Algorithm ◽

Natural Frequencies ◽

Design Criterion ◽

Rotor System ◽

Design Tool ◽

Generator Rotor ◽

System A ◽

Turbo Generator ◽

Design Variables ◽

Search Approach

The detailed design of a turbo generator rotor system is highly constrained by feasible regions for the damped natural frequencies of the system. A major problem for the designer is to find a solution that fulfills the design criterion for the damped natural frequencies. The bearings and some geometrical variables of the rotor are used as the primary design variables in order to achieve a feasible design. This paper presents an alternative approach to search for feasible designs. The design problem is formulated as an optimization problem and a genetic algorithm (GA) is used to search for feasible designs. Then, the problem is extended to include another objective (i.e., multiobjective optimization) to show the potential of using the optimization formulation and a Pareto-based GA in this rotordynamic application. The results show that the presented approach is promising as an engineering design tool.

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Rotating Shafts Affected by Transverse Cracks: A Sensitivity Analysis

Volume 4: Fatigue and Fracture; Fluids Engineering; Heat Transfer; Mechatronics; Micro and Nano Technology; Optical Engineering; Robotics; Systems Engineering; Industrial Applications ◽

10.1115/esda2008-59481 ◽

2008 ◽

Author(s):

Nicolo` Bachschmid ◽

Ezio Tanzi ◽

Paolo Pennacchi

Keyword(s):

Sensitivity Analysis ◽

Element Model ◽

Dynamical Behaviour ◽

Crack Model ◽

Transverse Cracks ◽

Rotating Shaft ◽

Shaft Line ◽

Linear Approach ◽

Turbo Generator ◽

Rotating Shafts

The dynamic behaviour of heavy, horizontal axis, rotating shaft-lines affected by transverse cracks can be analysed in the frequency domain by a quasi linear approach, using a simplified breathing crack model applied to a traditional finite element model of the shaft-line. This allows to perform a series of analyses with affordable efforts. The analysis of the modelling procedure allows to define an approximated approach for simulating the dynamical behaviour, which allows to predict the severity of the crack excited vibrations, combined to modal analysis. this answers to the old-age question on how deep a crack must be to be detected by means of vibration measurements. The model of a 320 MW turbo-generator group has been used to perform a numerical sensitivity analysis, in which the vibrations of the shaft-line, and more in detail the vibrations of the shafts in correspondence to the bearings, have been calculated for all possible positions of the crack along the shaftline and for two different values of the depth of the crack. The calculated results confirm the predicted behaviour.

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